Copy Animation to another rig
The correct way is to assign the "source" action to the target armature via the dopesheet, but there are 3 main problems in your attempt:

1) The scale of the two armatures are different (Source: 0.094, Target: 1)

2) The animation of source is expressed in hips location and all bones Euler rotation, while all target bones are on quaternion: you will have to select every bone in pose mode and switch it to euler rotation mode in the "N" panel; by now the target reads only hips location, every other animation information is lost.

3) The bone's location and roll angle are so different from source to target that I think is nearly impossible to make this animation work on the target rig (on this last point, maybe someone more expert than me has a solution)